CVE-2019-1010091 XSS in TinyMCE

Medium 6.1 Published 17 Jul 2019 Updated 5 Aug 2024

An attacker can execute arbitrary JavaScript by tricking a victim into pasting malicious content into the media element embed tab of the TinyMCE editor.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2019-1010091?

CVE-2019-1010091 is a medium-severity cross-site scripting vulnerability in tinymce, published on 17 Jul 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

tinymce 4.7.11, 4.7.12 is affected by: CWE-79: Improper Neutralization of Input During Web Page Generation. The impact is: JavaScript code execution. The component is: Media element. The attack vector is: The victim must paste malicious content to media element's embed tab.

Weakness: CWE-79

Which versions are affected by CVE-2019-1010091?

4 open source packages ship an affected version, including tinymce. It affects 1 product.

Package	Affected	Fixed in
`tinymce` npm	All versions	`4.9.10`
`tinymce` npm	All versions	`4.9.10`
`tinymce` npm	From `5.0.0`	`5.2.2`
`tinymce` npm	From `5.0.0`	`5.2.2`

Products include Tiny Tinymce.

How do I fix CVE-2019-1010091?

Upgrade tinymce to a fixed version for your release line: 4.9.10 or 5.2.2.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2019-1010091 being exploited?

There is no known exploitation of CVE-2019-1010091 in the wild and no public exploit code.

Sources

Also known as GHSA-c78w-2gw7-gjv3, UBUNTU-CVE-2019-1010091.